The Maintinance required light is on and won't go off

The light recently came on, and I am not a car person. However, with the economy like it is, I would like to try and repair it myself. Can someone give me a check list or something that I can look over to see what might be causing it and what I can do to fix it

Light goes on automatically and does not reference any particular "failure" If you wish to service your own vehicle, go ahead and do so. If any warranties are still in force, keep good records and receipts. Either put a piece of electrical tape over the dash light or have a local dealer or shop show you how to re-set it.

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Many things can contribute to low fuel economy, tire pressure, driving style, milage, and state of the servicing.
What sort of milage does the car have?
Has it had a tune up recently?
Air filter condition?
Fuel filter condition?
Transmission service if milage dictates?

If the freon level is ok, you have an electrical problem somewhere. The system will not activate because the control module "thinks" the freon level is low or because of another problem. It could be the module too.You'll need a shop manual to get the test procedures for climate control ac to check the components and circuits.

It's referring to a slow response from O2 oxygen sensor #2. It could be a defective O2 sensor. This won't prevent your car from running, but your fuel economy/emissions could suffer. I would start with double checking the connector first if you can get to it.

it provides instructions in your user manual. On my accord, i hold down the odometer button and then turn the car on. Keep it held down for about 10 seconds until the light turns off and it will reset the mileage counter for the mileage required light.

Perfectly normal.Starting with the 2005 model year, light duty full size pickups and
utilities are equipped with a new Regulated Voltage Control (RVC)
system. This system reduces the targeted output of the generator to
12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy.
The generator may exit "Fuel Economy Mode" if additional voltage is
required. This will cause the voltmeter to fluctuate between 12 and 14
volts as opposed to non-regulated systems that usually maintain a more
consistent reading of 14 volts. This fluctuation with the RVC system is
normal system operation and NO repairs should be attempted.

BMW 3 Series is a drivers car: it was designed to make the driver enjoy driving.For example the weight distribution of a BMW 3 series is 50% front 50% back which coupled with a rear wheel drive makes this car a blast to drive around corners.

The downside to being a performance/drivers car is that the complex suspension of the BMW requires frequent maintinance, and neglecting it may lead to a sub par performance of the car.